JPS6253411A - Process for wet treatment of yarn and apparatus therefor - Google Patents

Abstract

PURPOSE:To enable the uniform treatment of a pair of yarns wound spirally around a pair of rolls, by placing a pair of bars near the yarn-transfer path and contacting the bars with the yarns under specific condition. CONSTITUTION:The continuous set treatment of a pair of yarns is carried out by winding the yarns spirally in the same direction around a pair of rolls composed of the upper roll 1 and the lower roll 2 and transferring the yarns. A pair of bars 11, 12 are placed near the yarn-transfer path directing from the roll 2 to the other roll 1, and the yarns are made contact with the first bar 111 at the same side face and then with the second bar 12 at the opposite faces of the bar to separate the paths of the yarns. The yarns are passed through the same transfer path on the circumference of the upper and the lower rolls 1, 2 and between the roll 2 and the first bar 11.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a roll-type wet yarn processing method and apparatus for wet-processing continuously supplied yarn. This invention relates to an improvement for eliminating non-uniformity of two yarns when they are processed by a pair of rolls.

(B) Conventional technology Conventionally, in general, roll-type and wet-type yarn processing was carried out in Fiber Handbook, page 443, Figures 2 and 42 (published on November 30, 1964).
As shown in Maruzen, a pair of upper and lower rolls whose axes are tilted to each other is used to wrap the supplied yarn around the upper and lower rolls in a helical pattern, run it, scouring it, drying it, and then turning it into a yarn. It was winding up the rope. This process is inefficient;
Various improvements have been proposed, but each has its own problems in terms of industrial implementation, and improvements have long been desired.

devices have been proposed (for example, Japanese Patent Publication No. 31-2364
and U.S. Pat. No. 2,883,259). However, with this method and apparatus, it is not possible to make the running path length and the contact length with the rolls between the yarns the same, and therefore it is not possible to eliminate the non-uniformity between the yarns.

In order to resolve the non-uniformity of multiple processed yarns,
As a method of making the traveling path length and the contact length with the rolls between each yarn the same, two yarns are separated from each other on a pair of rolls.
A method of running in a heavy spiral has been proposed (Japanese Patent Publication No. 53-49119 and U.S. Patent No. 2294871)
No. Specification). However, in this method, the two yarns are always run apart from each other, so it is necessary to provide a helical spacing of more than a certain value to prevent adjacent yarns from adhering to each other and becoming entangled. Industrial implementation poses great difficulties because of the large amount of material required.

In order to improve the drawbacks of these methods, Japanese Patent Laid-Open No. 59-204907 proposes a twin-roll continuous wet spinning method and apparatus.

In this proposal, multiple threads are run on paired rolls, each thread takes the same running path while passing through the upper roll and reaching the lower roll, and each thread is separated by separate rolls while passing through the lower roll and reaching the upper roll. The threads were separated and took different running paths.

Although this attempt was an effective means of eliminating differences in physical properties between each yarn and increasing processing speed, it was highly dangerous to work because the separation roll rotated at high speed, and the presence of the separation roll However, the disadvantage was that the equipment cost was high. This drawback increases as the yarn running speed increases, and is disadvantageous for industrial implementation.

(c) Problems to be Solved by the Invention The purpose of the present invention is to solve the above-mentioned drawbacks of the conventional twin-roll type wet yarn processing method and apparatus, namely, the non-uniformity of the physical properties of the obtained yarn. This method improves industrial disadvantages such as the need for long rolls, uniformity of the physical properties of the yarn, improves the efficiency of equipment, and provides a method that is safe and stable for industrial operation. The purpose is to supply equipment.

(d) Means for Solving the Problems In the wet yarn processing method of the present invention, two yarns are wound in the same helical shape on a pair of rolls and run, and are passed from the upper roll to the lower roll or the lower roll. The two threads traveling from the roll to the upper roll are separated by a bar placed on the running path between the rolls, and each thread is separated and takes a different running path on the side where the bar is installed. The running yarns are made to run on the same running path on the upper and lower rolls and after being separated from the rolls and before reaching the first bar. In other words, two yarns contact the same circumferential surface of the first bar that comes into contact with the first bar after the yarn is released from the roll, and then two bars that come into contact with the second bar after the yarn leaves the roll. For the actual bar, the two bars are held together and run while contacting opposite circumferential surfaces of the bar.

In this way, even if the roll entrance positions of the two yarns are the same, each time the yarn goes around the upper and lower rolls, it is repeatedly and constantly separated, the false twist that occurs on the rolls is destroyed, and at the roll exit. The yarn is easily separated into the original two yarns, and a stable yarn running state can be obtained. Furthermore, since the helical interval between the two yarns does not have to be increased compared to when only one yarn is run, there is no need to install a long roll, and an increase in equipment costs can be minimized.

Further, the two yarns are guided onto the pair of rolls and run around the outer periphery of the upper and lower rolls in the same helical shape, during which the yarns are subjected to reaction, scouring, and drying treatment. At the point where the two threads separate,
While the two yarns are brought into contact with the opposite circumferential surfaces of the bar with a second bar installed on the running path, each yarn is separated and takes a different running path. The roads are symmetrical and there is no difference in travel path length. Therefore, the two threads are subjected to treatments such as reaction, scouring, and drying under extremely uniform conditions, and the difference in physical properties between the resulting threads can be reduced.

In the method of the present invention, in which two yarns are brought into contact with one side circumferential surface of the first bar, and the two yarns are separated downstream, the first bar The thread is squeezed, and the thread tension between the second bar and the roll on which the thread runs next can be adjusted appropriately, and the runnability of the thread can be stabilized. On the other hand, the yarn tension before it touches the first bar is lower, but if you shorten the running path length by adjusting the bar position, the yarn sway will also be reduced, making it easier to use these bars. It is possible to avoid destabilization of yarn running due to this.

, the role of the first bar is to move away from the rotating roll 2
The purpose is to make the separation positions of the threads of the book the same. When separating two yarns from a rotating roll, if the separation positions are different from each other, the single yarn of the yarn that is separated first is likely to be picked up by the yarn that is separated later, and the two yarns are separated. uneven fineness of yarn,
Easy to generate fluff and cut threads. This occurs because the liquid film that forms between the yarn that was separated earlier and the yarn that is separated later pulls the yarn that was separated earlier in the direction of the yarn that is separated later. be. To prevent this, furthermore,
In the method of the present invention, the first bar drains the droplets adhering to the yarn, which improves the running stability of the yarn, and also improves the scouring efficiency because the scouring chemicals are replaced sufficiently. can be improved.

Furthermore, the selection of the diameter of the second bar is less constrained by the conditions of the supplied yarn, such as the processing speed and the amount of water brought into the yarn, and the diameter of the second bar can be selected more suitably according to the conditions of the yarn to be processed. Not only can the bar be selected, but also the yarn can be processed under more suitable conditions.

The method of the present invention can be used to treat wet yarns such as viscose rayon, cuprammonium lacone, acrylonitrile polymer yarns, wholly aromatic polyamide yarns, and the like.

Next, a twin-roll type wet yarn processing apparatus used to carry out the method of the present invention will be explained.

As in the present invention, a device that separates two yarns by using the first and second bars that contact each other after the yarn leaves the roll, the two bars are rotated upward by the lower roll. The side that does
It may be placed on either side of the side where the upper roll rotates downward, and this can be selected depending on the design of the device or workability.

If the bar is installed on the side where the bottom roll rotates upwards, it should be placed near the bottom roll; if it is installed on the side where the top roll rotates downwards, it should be placed near the top roll. It is preferable to install them respectively. Specifically, at the point where the yarn separated by the second bar enters the roll, there are 2
It is preferable that the threads of the book are in contact with each other and the helical spacing is the same. To achieve this, the threads are brought into contact with each other by the surface tension of the coagulating liquid or scouring chemical that adheres to the threads. It is desirable to install the second bar in a position where it can be used. That is, it is desirable to install the yarn so that the yarn travel path after passing the second bar to the roll is long.

In addition, in order to make the two yarns come into contact with the opposite circumferential surfaces of the bar with the second bar in between, the center of the second bar is aligned with the center of the first bar at the common outer tangent of the upper and lower rolls. If it is on the inside of the first bar and the roll stop in the yarn running direction, it is on the common inner tangent line, or if it is on the outside of the common outer tangent line, it is 1.
It is necessary to install the bar on a common external tangent between the main bar and the roll in the yarn running direction, or at a position within the radius of the second bar from the common external tangent.

The need for the two yarns to come into contact with opposite circumferential surfaces of the second bar with the second bar in between is to equalize the running path length and yarn tension of the two yarns, and to The accompanying coagulating liquid, scouring chemical liquid, etc. are squeezed by the bar and form droplets on the bar, but the purpose is to allow these droplets to be carried away by the yarns that are in contact with them without allowing them to grow. If the yarn is brought into contact with only one side of the second bar, a droplet will grow on the bar, and due to the surface tension of this droplet, it will come into contact with the helix of the yarn running next to it, and it will cause the droplets to contact each other. Tangled and thread breakage occurs.

Furthermore, in order to carry out the present invention more preferably, the center of the second bar is located within the yarn traveling direction of the first bar when the center of the first bar is inside the common external tangent line of the upper and lower rolls. If the center of the first bar is outside the common external tangent line of the upper and lower rolls, it can be installed on the common external tangent line between the first bar and the rolls in the yarn running direction. good. As a result, the traveling path length and yarn tension of the two yarns can be made substantially the same, and the coagulating liquid, scouring chemical liquid, etc. that have been squeezed by the bar and become droplets on the bar can be applied to the yarn. The effect of carrying away the fibers becomes greater, and the uniformity of the physical properties of the yarn and the running stability of the yarn become even better.

The diameter of each bar is preferably in the range of 2.0 m111φ to 30 mmφ. If a bar with an extremely small diameter of less than 2.0 mmφ is used as the first bar,
Due to the tension of the threads, the bar becomes arched, making it difficult to bring the two threads into contact with both sides of the second bar. An increase in the physical property difference 1, etc. occurs due to an increase in the difference in the tension history of the yarns. If a bar with an extremely small diameter of less than 2.01φ is used as the second bar, the separation angle between the two yarns will be small, and the single yarn of one yarn will be easily taken up by the other yarn. Inconsistency in the fineness and number of single yarns between the yarns of the book tends to occur, as well as an increase in the number of fuzz and cut yarns.

If a bar with a large diameter exceeding 30 mmφ is used as the first bar, the frictional force applied to the yarn will increase, and the yarn tension between the roll and the first bar will decrease, causing the yarn spiral to sway or , winding of the single yarn around the roll becomes more likely, and the yarn tension between the first bar and the next roll increases, and as a result, the elongation decreases. If a bar with a large diameter exceeding 30 mmφ is used as the second bar, a large amount of droplets generated at the bottom of the bar will fall, causing irregularities in the separation positions of the two yarn running paths and the helical helix of the yarn running. Make it easier to cause lateral vibrations. In addition, the frictional force applied to the yarn increases, causing the yarn spiral to sway due to a decrease in yarn tension between the first and second bars, and the yarn tension between the second bar and the next roll. As a result, the elongation tends to decrease.

More preferably, the diameter of the bar is 3 mmφ to 10 mmφ.
It is recommended to set it within the range of . The reason for this is to reduce the frictional force applied to the yarn, suppressing the horizontal sway of the yarn running helix and the decrease in elongation, and also to prevent the droplets that form at the bottom of the second bar from running on both sides of the bar. By reducing the number of droplets that grow and fall, the aim is to reduce the unevenness of the separation position of the two thread running paths and the frequency of lateral oscillation of the running helix of the thread. . This effect becomes even more pronounced when the yarn running speed is increased.

In addition, the diameter of the bar is determined by the tension of the running yarn, the amount of liquid being stirred,
It is preferable to select it appropriately depending on the thread running speed, etc.
In particular, when performing processes such as reaction, scouring, and drying on rolls, for example, scouring chemicals are actively applied to increase the amount of liquid mixed with the yarn, and the yarn swells due to the chemical. When performing on a roll, increase the diameter of the second bar to increase the separation angle of the yarn, and
It is preferable to run the yarn with increased tension.

Although there is no problem even if the bar is stationary, it is desirable to move the bar slowly in order to run the yarn stably for a long period of time. When processes such as reaction, scouring, and drying are performed on the counter roll, reaction by-products, low polymerization products, decomposition products of chemical solutions, etc. adhere to or grow on the bar, resulting in a decrease in running stability and quality of the yarn. However, this can be overcome by gently moving the bar, preferably by slowly rotating it and gently reciprocating it in the axial direction. The speed of rotation and reciprocation of the bar may be very slow; for example, one rotation or one reciprocation every 10 minutes is sufficient.

"Slowly" here refers to a rotation speed of 40 rotations/min or less and a reciprocating speed of 10 reciprocations/min or less; at such speeds, there is little concern about work hazards, and the running direction of the yarn is The thread running stability is not deteriorated due to movement in the opposite direction or perpendicular direction.

The present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an example of a twin-roll type warm yarn processing apparatus according to the present invention. This is an example in which two bars 11 and 12 are provided on the inside of the side where the lower roll rotates upward (inside the common tangent line of the upper and lower rolls) for a pair of upper roll l and lower roll 2. . This wet yarn processing apparatus consists of an upper roll 1, a lower roll 2, and bars 11 and 12 whose axes are tilted to each other, and here a scouring chemical supply device 5 and drying devices 7° and 8 are added. The entrance position to the upper roll L of the yarns 1o and 10', the yarn traveling path between the upper and lower rolls on the side from the upper roll 1 to the lower roll 2, the upper part of the lower roll 2, and from the lower row L to the first bar 11 The thread running paths are made to be the same.

Next, on the running path from the first bar 11 toward the upper roll 1, the two yarns 10 and 10' come into contact with the opposite circumferential surface of the bar 12, sandwiching the second bar 12 placed on the running path. However, take a different route. The yarns io and io' separated by the second bar 12 adhere to each other at the point where they reach the upper roll 1, and run on the upper roll 1 while taking the same traveling path.

While repeating the above running mode, the yarn reaches the drying devices 7 and 8, and is wound up after being dried.

Fig. 1 shows an example in which two bars 11 and 12 are installed on the inside of the side where the lower roll 2 rotates upward, but Fig. As shown in several examples, the installation positions of the bars 11 and 12 are on the inside (a) or outside (o) of the side where the lower roll 2 rotates upward.
It may be either the inside Q→ or the outside (D) of the side where the upper roll 1 rotates downward.

Furthermore, although not shown, on both the side where the lower roll 2 rotates upward and the side where the upper roll 1 rotates downward,
It is also possible to install two bars 11 and 12 for processing.

(e) Effects of the invention In the method of the invention, in processing two threads,
The same roll as when processing one yarn can be used, and the point at which the yarn leaves the rotating roll can be made the same, so the running path length of the two yarns to be processed, The contact length with the roll can be made the same,
Two threads can be subjected to reactions, refinements, etc. under uniform conditions. As a result, non-uniformity in the physical properties of the two yarns obtained can be extremely reduced.

In addition, since the first and second bars are used, it is easy to select a suitable diameter of the bar according to the processing conditions of the yarn on the roll, and it is easy to adjust the tension of the yarn and the amount of liquid brought into the yarn. It becomes possible to maintain suitable conditions such as the above, and the running stability of the yarn can be greatly improved, and the running speed of the yarn can be increased.

The apparatus of the present invention can employ the same rolls as when processing a single yarn, and moreover, there can be almost any number of rolls. Further, since the yarn does not become wrapped around the bar, and even when it is rotated, the rotational speed may be extremely low, so that operational safety can be greatly improved.

(f) Example Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 1 Viscose rayon yarn was treated using the twin-roll wet yarn treatment method and apparatus of the present invention.

The equipment used was of the type shown in Figure 1, and the bar was installed in the same position as shown in Figure 2 (A).

The diameter of the upper and lower rolls is 150 mm, and the diameter of the bar is 2.
Both books are 6mm+ bound. To install the bars, fix the first bar at a position 90mm from the center of the bottom roll and 10LLiffi inward from the common external tangent line of the top and bottom rolls, and then install the second bar above the first bar. It was fixed and attached at a position 20 mm from the center of the first bar on the common inscribed line with the roll. The yarn helix spacing was 5 mm, two yarns of 75 denier/26 filaments were supplied at a running speed of 300 m 2 /min, and the yarns were run on a pair of rolls with the same entry position into the roll. The two threads are
The same traveling route is taken from the upper roll to the first bar via the lower roll, and separate traveling routes are taken from the first bar to the upper roll as shown in Figure 2 (a). I let it run. While the yarn travels between the upper and lower rolls, the yarn is subjected to a scouring process and a drying process on a portion of the roll.

*l Difference in dyeing is determined by tube-knitting the obtained yarn and dyeing it.
The color difference was visually measured based on the color difference of the JIS LO804 gray scale for discoloration and fading. In addition, based on yarn 1,
The color difference of yarn 2 was measured. In addition, the color difference of the JISLO804 gray scale for discoloration and fading is determined by the Adams-Nirakarlin color difference formula (in NBS units), so
The unit of staining difference was expressed as NBS.

*2. The measurement of whiteness is based on JTS L1013.

*3 Thread 1 is shown as thread 10 in FIG. 2 (A), and thread 2 is similarly shown as thread 10'.

As shown in Table 1, the two obtained yarns exhibited uniform quality and the running condition of the yarns was also good.

Example 2 Copper-ammonia type rayon yarn was treated using the twin-roll type, wet type yarn treatment method and apparatus of the present invention. The device used was of the type shown in Figure 1, and the bar was installed in the second position.
The procedure was as shown in Figure to). The diameter of the upper and lower rolls is 1501
The diameter of the first bar was 5 mm, and the diameter of the second bar was 811 Im.

The bars are installed at a position where the first bar is 110vw from the center of the lower roll and 15mm outward from the common external tangent line of the upper and lower rolls, and the second bar is connected to the first bar and the upper roll. It was attached at a position of 301 from the center of the first bar on the common external tangent of the bar.

Both of the two attached bars were rotated at 1 rotation/min in the opposite direction to the lower roll and moved 5fflI11 in the axial direction at a speed of 0.2 reciprocation/min. Thread helix spacing is 5■
Two yarns of 60 denier/46 filament were supplied at a running speed of 400 m/min, and the two yarns were run on the opposite roll with the same entry position into the roll.2
The main yarn is made to take the same running route from the upper roll to the lower roll to the first bar, and a separate running route to the second bar while running from the first bar to the upper roll. figure(
The vehicle was run under the conditions shown in ol. While the yarn ran on the upper and lower rolls, a portion of the roll was treated with 10% sulfuric acid, washed with water, and dried, and then wound up with a winder.

Table 2 shows the properties of the obtained yarn and the thread cutting rate during treatment.

Table 2 *1 The color difference between yarn 1 and yarn 2 was measured using the same method as in Example 1.

*2 Yarn 1 is shown as yarn 10 in FIG. 2 (ol), and yarn 2 is similarly shown as yarn 10'.

As shown in Table 2, the two yarns obtained showed uniform quality and the running condition of the yarns was also good.

Example 3 Viscose rayon yarn was bleached using the twin-roll wet yarn treatment apparatus of the present invention. The equipment used corresponds to the one shown in Figure 1, except that a nozzle that adds moisture to the yarn before it enters the pair of rolls and a device that applies bleaching solution before the scouring process are added. The treatment was carried out using the same apparatus as F1). Bleach solution: A 0.05% hydrogen peroxide aqueous solution was used.

Table 3 shows the properties of the obtained threads and the thread cut rate during processing.

Table 3 *1 The color difference between yarn 1 and yarn 2 was measured using the same method as in Example 1.

*2 Yarn 1 is indicated by thread number 0 in FIG. 2 (A), and thread 2 is similarly indicated by thread 10'.

As shown in Table 3, the two yarns obtained showed uniform quality and the running condition of the yarns was also good.

Comparative Example The second bar was installed at a position 5III11 outside the common internal tangent line between the first bar and the upper roll, and the other conditions were the same as in Example 1, and the two yarns were run and processed. Ta. The running condition of the yarn during processing was particularly poor in the scouring process, with frequent occurrences of shaking of the yarn helix, uneven separation points of the two yarns, etc., and the thread cutting rate was also poor at 4.50 times/24". It was something.

Examples 4 to 21 Viscose rayon yarn was treated using a twin-roll≠Sakura wet yarn treatment device to confirm the effects of the method and device of the present invention. The apparatus used was of the type shown in FIG.

In order to confirm the effects of the present invention, the diameter of the first bar was determined in Examples 4 to 11, the diameter of the second bar was determined in Examples 7 and 12 to 18, and the diameter of the bar was determined in Examples 7 and 19 to 21. We compared and tested examples in which two types of yarn were processed by changing the position.

The diameter of the upper and lower rolls was 150 mmφ, and the positions shown in FIG. 2 were used for mounting the bars, and the mounting positions of the bars in Table 4 are shown in the column of positions. The helical distance between the yarns running on the upper and lower rolls is 5 mm, and the yarn is 120 denier/40
The filament threads were processed at a running speed of 300 m/min, and the positions on the rolls were the same. The running state of the yarn is shown in Figure 2, after the yarn passes the first bar,
After passing through the second bar, the yarn passed through separate travel paths until it entered the next roll in the yarn travel direction, and the rest of the yarn passed through the same travel path. While the yarn ran between the upper and lower rolls, the yarn was subjected to a scouring process and a drying process, and then wound up with a winder.

Table 4 shows the cutting rate during the treatment.

The effect of the present invention is clear from the cut rate results in Table 4.
It can be seen that using the method and apparatus of the present invention in roll-to-roll and wet yarn processing allows a plurality of yarns to be processed efficiently.

Below margin Table 4

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the wet yarn processing apparatus and method of the present invention. FIGS. 2A, 2B, and 2B are side views showing several examples of the installation positions of rolls and bars in the wet yarn processing apparatus and method of the present invention. 1... of the pair of rolls. Upper roll, 2...Lower roll of the pair of rolls, 3...Arrow indicating the rotation direction of the upper roll, 4...Arrow indicating the rotation direction of the lower roll, 5...Scouring chemical liquid supply nozzle, 6... Scouring area, 7 and 8... Drying device, 9... Yarn path, 10 and 10'... Yarn, 11... 1st pie-1 12... 2-mouth bar, 13... Thread helix spacing.

Claims (1)

[Claims] 1. A method in which two yarns are continuously wet-processed using a pair of rolls consisting of an upper roll and a lower roll, and the yarn is wound around the pair of rolls in a helical shape and progresses. After the yarn is released from the roll, the two yarns are brought into contact with the first bar on the same side, and then after the yarn is released from the roll. , the second bar that comes into contact with the second bar is sandwiched between the two bars and is brought into contact with opposite circumferential surfaces so that each thread is separated and takes a different running path, and at least on the circumferential surface of the upper and lower rolls. A wet yarn processing method characterized in that the yarn traveling between the first bar and the first bar after being separated from the roll is made to travel on the same traveling path. 2. The wet yarn processing method according to claim 1, in which the diameter of the bar is in the range of 2 mmφ to 30 mmφ. 3. The wet yarn processing method according to claim 1, which uses a bar fixed so as not to rotate. 4. The wet yarn processing method according to claim 1, which uses a bar that rotates slowly and slowly reciprocates in the axial direction. 5. In an apparatus that uses a pair of rolls consisting of an upper roll and a lower roll, and continuously wet-processes the yarn by winding it in a helical pattern around the pair of rolls and moving it forward, the first step after the yarn is separated from the roll is A second bar that contacts the second bar after the yarn is separated from the roll is installed between the first bar that comes into contact with the roll in the yarn running direction, and the second bar is connected to the first bar. A wet yarn processing device characterized in that the two yarns that have passed through one side circumferential surface of a bar are installed at a position where the two yarns that have passed through one side circumferential surface of the bar abut mutually opposite circumferential surfaces of a second bar. 6. The wet yarn processing device according to claim 5, wherein the diameter of the bar is in the range of 2 mmφ to 30 mmφ. 7. The wet yarn processing device according to claim 5, wherein the bar is fixed so as not to rotate. 8. The wet yarn processing device according to claim 5, wherein the bar rotates slowly and moves slowly as a piston in the axial direction.